The use of potential-dependent adsorption to separate an organic compound from solution was demonstrated experimentally. Isotherms for the adsorption of β-naphthol on glassy carbon were obtained over a range of potential of 1.0 V. Adsorption of β-naphthol, in dilute concentration, from aqueous electrolytic solution was also carried out in a flow-through porous electrode consisting of nonporous microspheres of glassy carbon. A counterelectrode was located downstream and the potential was controlled at the end of the porous electrode nearest to the counterelectrode. Analysis of measurements of the transient potential distribution along the length of the porous electrode and of the current showed that each arose from charging of the electrical double layer. Profiles of effluent adsorbate concentration during both adsorption and desorption confirmed a theoretical model of electrosorption in a flow-through porous electrode. Cyclic electrosorption was experimentally demonstrated.
- potential distribution
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Renewable Energy, Sustainability and the Environment
- Surfaces, Coatings and Films
- Materials Chemistry